JP2001321397A - Method of manufacturing laminated material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form continuously folds in the flow direction of a web in a manufacturing method of a laminated material. SOLUTION: This method of manufacturing a laminated material by overlapping a pair of webs 12 and B while transferring them comprise a process of forming the first web 12 in corrugated shape corrugated along the feed direction of the web 12 while transferring the first web 12 along the surface of a rotation body repeatedly having projecting pars and recessed parts long in the cross direction of the first web 12, and a process of overlapping the flat second web B on the first web 12 and bonding the second web B at the projecting surface of corrugated shape in the first web 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a laminated material such as disposable wearing articles and building materials.

[0002]

2. Description of the Related Art In disposable wearing articles such as napkins, disposable diapers or incontinence pads, the surface of the article is corrugated to increase the surface area, improve the absorption capacity, or realize soft contact with the skin. Or

[0003]

Problems to be Solved by the Invention Patent No. 2,851,7
No. 84 discloses a method of folding an article at right angles to the longitudinal direction of the article. However, this prior art folds the articles after dividing the articles individually. Therefore, a continuous waveform cannot be formed.

Here, as shown in FIG. 6A, a pair of upper and lower nip rolls 101 and 102 is provided, and the peripheral speed of the upper nip roll 101 is made slightly lower than that of the lower nip roll 102 so that the upper and lower rolls 101 and 102 By slipping, the article 100 having a waveform as shown in FIG. 6B is obtained. However, in this method, the substrate web 1
No. 03, 104 are damaged or the upper and lower rolls are worn, so that they have not been put to practical use.

[0005] It is therefore an object of the present invention to produce a continuous fold in the web flow direction in a method of manufacturing a laminate.

[0006]

In order to achieve the above object, the present invention relates to a method of manufacturing a laminated material in which a pair of webs are transported and overlapped with each other to obtain a laminated material.
While transporting the first web along the surface of the rotator having the long and long projections and recesses repeatedly in the width direction of the web, the first web was wavy along the feeding direction of the web. Forming a corrugated shape; and laminating a flat second web on the first web, and bonding the second web on a corrugated convex surface of the first web. . In the present invention, the term “web” includes, in addition to a woven fabric and a nonwoven fabric, a layered or film-like sheet material such as a liquid-absorbing layer or a sound-absorbing layer deposited in a cotton-like manner.

According to the present invention, along the longitudinal direction of the first web, the front side and the back side of the first web are formed into a wavy waveform over substantially the entire area in the longitudinal direction.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. First, prior to description of the production method of the present invention, an example of an article obtained by the production method will be described.

FIG. 1 shows a sanitary napkin as an example of a disposable wearing article. In the longitudinal sectional view of FIG. 1A, a core C is interposed between a liquid-permeable top sheet T and a liquid-impermeable back sheet B. FIG.
As shown in (c), the core C is wrapped in, for example, a bag-shaped carrier sheet Cs. In addition, as the carrier sheet Cs, generally, a thin paper such as a tissue is used, but a nonwoven fabric can also be used.

The core C is made of fluff pulp obtained by fibrillating (crushing) pulp in a fibrillator (crusher) or a mixture of fluff pulp mixed with superabsorbent polymer particles (polymer absorber). It is deposited in a cotton-like manner and has liquid absorbing properties. As shown in FIGS. 1A and 1B, the core C, the carrier sheet Cs, and the top sheet T are formed in a wavy waveform on the front side and the back side substantially over the entire length of the napkin N in the longitudinal direction L. Have been.

On the back side of the core C, a substantially flat back sheet B is provided via a carrier sheet Cs.
In a, it is adhered. Thereby, the waveform shape of the core C is maintained. The back sheet B and the top sheet T are adhered to each other over the entire circumference at the round seal portion Rs, as shown in FIG.

Next, an example of a method for manufacturing the napkin N will be described. In FIG. 2, the pattern drum 24
, A mesh-shaped punching plate is formed in a predetermined pattern on the outer periphery thereof, and a portion of the pattern is sucked inward by a vacuum fan (not shown). On the other hand, while unwinding the raw pulp from the roll pulp 21, the raw pulp is defibrated by the defibrating machine 22 and the defibrated fluff pulp is transferred to the pattern drum 24.
The absorber 10 shown in FIG. 3A is obtained by blowing upward and suctioning the inside of the pattern drum 24 with a negative pressure. In addition,
If necessary, the fluff pulp is mixed and supplied with superabsorbent polymer particles from the resin powder supply unit 23 in FIG.

On the other hand, the carrier sheet Cs is unwound from the carrier roll 20, and the absorber 10 is laminated on the carrier sheet Cs. Then, C hold machine 2
6, the both ends of the absorber 10 are connected to the carrier sheet C.
The first laminated body 11 of FIG.

On the other hand, the top sheet T shown in FIG. 2 is unwound from the top sheet roll 25, and an adhesive is intermittently applied to the top sheet T by an applicator 29. The top sheet T and the first laminated body 11 are laminated in the laminating machine 30 to obtain the second laminated body 12 in FIG.

The second laminate 12 is supplied to a molding machine 40 described below. The molding machine 40 includes a deformed conveyor (rotating body) 41, a deformed roll (drive body) 42, and a flat belt conveyor 46.

In the deformed conveyor 41, the blades 43 are attached to the chain conveyor with slats at a constant pitch, and the interval between the tips of the blades 43 is increased in the curved portion 41c and is equal in the straight portion 41s. Shrink. The deformed conveyor 41 is provided with the respective blades 43, 43.
The space therebetween forms the concave portion 44. In addition, the wing plate 4
Reference numeral 3 is formed to be long in the width direction orthogonal to the transport direction (longitudinal direction) of the second stacked body 12.

The deformed roll 42 has a plurality of convex portions (drive convex portions) 45 which are long in the width direction. The convex part 4
5 is that the deformed roll 42 rotates in synchronization with the deformed conveyor 41 so that the concave portion 44 is rotated in a predetermined cycle.
And withdraws from the concave portion 44.

The second laminated body 12 is supplied at a curved portion 41c of the irregularly shaped conveyor 41, and is supplied to the curved portion 4c.
It is transported from 1c along the straight portion 41s. The second
While the stack 12 is being transferred from the curved portion 41c to the straight portion 41s, the interval between the tips of the blades 43, 43 becomes narrower, and the third stack 1 shown in FIG.
It becomes 3. By rotating the deformed roll 42 in FIG. 2 in synchronization with the deformed conveyor 41, the convex portion 45 enters the concave portion 44 at a predetermined cycle, and the waveform shape of the third laminate 13 is made uniform. .

On the other hand, the back sheet B shown in FIG. 2 is unwound from the back sheet roll 50, the adhesive is intermittently applied to the back sheet B by the coating machine 51, and the straight portion 41s of the flat belt conveyor 46 and the irregularly shaped conveyor 41 are formed. 3 (e), the corrugated convex surface Ca and the back sheet B
And the back sheet B is bonded to the third laminate 13
Laminated. As a result, the fourth laminate 1 shown in FIG.
4 is obtained.

The obtained fourth laminated body 14 is set in a state where the peripheral portion is laid down by the side guide 60 in FIG.
The heat is supplied to the heat sealing machine 27, the outer periphery of the top sheet T and the core C is heat-sealed, further supplied to a well-known round cutter 28, and trimmed at the round seal portion Rs in FIG. Thereafter, according to a conventional method, a wrapping paper also serving as a release paper is placed from a wrapping paper roll (not shown) and folded together with the napkin body. Note that, as is well known, a slip preventing tape or the like may be provided on the upper surface of the back sheet B, or a gather may be formed.

The napkin of FIG. 1 formed in this manner has a large weight per unit area, that is, a basis weight. In addition, this article can be applied to disposable diapers and incontinence pads,
In such articles, body fluids and solid excretions can be prevented from moving in the longitudinal direction. Moreover, since the contact with the human body is close to the line contact, dirt around the local area is reduced.

Next, another example of the molding machine 40 will be described. In FIG. 4, the driving body 42A includes a driving projection 45A that moves up and down at a constant cycle. The driving convex portion 45A moves up and down in synchronization with the irregular conveyor 41 to enter the concave portion 44 and give the second laminate 12 a corrugated shape. The amplitude of the wave can be adjusted by controlling the amount of entry of the driving projection 45A.

The forming machine 40 shown in FIG. 5 includes a first forming roll (rotating body) 41B, a second forming roll (drive body) 42B, and a heater roll 46B. The first and second
The forming rolls 41B and 42B are respectively provided in the second laminate 1
2 is formed in a gear shape having a convex portion 47 and a concave portion 48 long in the width direction, and imparts a corrugated shape to the second laminate 12. The heater roll 46B is made of a base material 4 having heat insulating properties.
Heaters 46b are buried at a predetermined angular pitch in 6a. The heater 46b is rotated by the first forming roll 41B and the heater roll 46B in synchronization with each other, so that the first forming roll 41B
Is pressed against the protruding surface of the projection 47. Thereby, the corrugated convex surface of the second laminate 12 is bonded (heat-sealed) to the back sheet B. In addition, by controlling the rotation speed of the first forming roll 41B and the heater roll 46B,
The pitch of the waves can also be adjusted.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will easily envisage various changes and modifications within the obvious scope by referring to the present specification. Would. For example, the present manufacturing method can be applied to a method for manufacturing a building material in addition to a disposable wearing article. As the building material, a material having sound absorbing or heat insulating properties, such as glass wool, is formed into a corrugated shape as the first web instead of the above-mentioned liquid-absorbing fluff pulp. Since the building material manufactured by this manufacturing method can freely control the basis weight (weight per unit area) of the mat layer, the sound absorbing property and the heat insulating property are improved. Accordingly, such changes and modifications are to be construed as being within the scope of the invention as defined by the appended claims.

[0025]

As described above, according to the present invention,
In the method of manufacturing a laminated material, continuous corrugated folds can be formed on the web.

According to the third aspect of the present invention, the amplitude of the wave can be adjusted by controlling the amount of entry of the driving projection that moves forward and backward.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view, a plan view and a transverse sectional view showing an example of an article obtained by a production method of the present invention.

FIG. 2 is a schematic configuration diagram illustrating manufacturing equipment for realizing the present manufacturing method.

FIG. 3 is a view showing a manufacturing process of a laminate.

FIG. 4 is a schematic configuration diagram showing another example of a molding machine.

FIG. 5 is a schematic configuration diagram showing still another example of a molding machine.

FIG. 6 is a schematic configuration diagram showing a conventional manufacturing method and a perspective view of a laminated material.

[Explanation of symbols]

 12: Second laminate B: Back sheet 40: Forming machine 41: Deformed roll 42: Deformed roll

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Claims (3)

[Claims] 1. A method of manufacturing a laminated material for obtaining a laminated material by transferring a pair of webs to each other while transferring the pair of webs, the method comprising: Forming the first web into a corrugated shape waving along the feed direction of the web while transporting the first web along the web; And laminating the second web on the corrugated convex surface of the first web. 2. The method according to claim 1, wherein the first web contains a core in a carrier sheet. 3. The driving member according to claim 1, further comprising a driving member that is driven in synchronization with the rotation of the rotating member, the driving member having a driving protrusion that is long in a width direction of the web. A method of manufacturing a laminated material, wherein the corrugated shape is formed by entering the concave portion of the rotating body and retracting from the concave portion in a predetermined cycle.